LECTURE IX. 99 



By the time it is fully grown the natural fall of the 

 nut takes place, and the animal, not at all injured 

 by the shock, creeps out at the circular hole which 

 it has previously prepared, and immediately bur- 

 rows under ground, where, after a certain time, it 

 casts its skin and commences chrysalis, or pupa, 

 in which state it remains all winter, and till the 

 beginning of the following August, when it 

 emerges from its concealment and appears in its 

 complete form. Its colour is a dull, uniform 

 brown. 



The order Coleoptera or the sheath-winged 

 tribe contains a great many other very curious 

 genera, both of large and small size, but the 

 limits of our Lecture will not allow us to parti- 

 cularize more than a few examples of each order 

 of insects. 



I shall therefore now pass to the second Lin- 

 naean order, called Hemiptem, or as it were Half- 

 winged insects j for in this order the wing-sheaths 

 are of a tough or leathery constitution at their 

 upper part, and soft, or membranaceous at the 

 lower, and the real or under-wings are often of 

 great size, and pleated longitudinally in the man- 

 ner of a fan. This order qontains all the in- 



